Created
April 12, 2015 23:02
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import pymongo | |
from . import encoders | |
from . import hooks | |
class BaseResource: | |
def __init__(self): | |
self.mongo_client = pymongo.MongoClient() | |
@property | |
def encoder(self): | |
return encoders.ObjectIDEncoder() | |
def get_endpoint_fn(self, endpoint): | |
return { | |
"Create": self.on_post, | |
"Read": self.on_get, | |
"Update": self.on_put, | |
"Delete": self.on_delete, | |
}[endpoint] | |
def add_hook(self, endpoint, hook, target): | |
endpoint_fn = self.get_endpoint_fn(endpoint) | |
# Initialize hooks dictionary if required | |
if not hasattr(endpoint_fn, "hooks"): | |
endpoint_fn.hooks = dict() | |
# Create hook list if necessary and append new hook to it | |
if not hook in endpoint_fn.hooks: | |
endpoint_fn.hooks[hook] = list() | |
endpoint_fn.hooks[hook].append(target) | |
def run_hooks(self, endpoint, hook, req, resp, *args, **kwargs): | |
endpoint_fn = self.get_endpoint_fn(endpoint) | |
for hook_fn in getattr(endpoint_fn, "hooks", list()): | |
(args, kwargs) = hook_fn(req, resp, *args, **kwargs) | |
return (args, kwargs) | |
def serialize_response(self, req): | |
def rename_id(doc): | |
doc["id"] = doc["_id"] | |
del doc["_id"] | |
return doc | |
if isinstance(req["data"], pymongo.cursor.Cursor): | |
req.context["data"] = [rename_id(doc) for doc in req["data"]] | |
else: | |
req.context["data"] = rename_id(req.context["data"]) | |
# Pagination output | |
if "pagination" in req.context: | |
req.context["data"] = [req.context["pagination"], req.context["data"]] | |
return self.encoder.encode(req.context["data"]) | |
def on_get(self, req, resp): | |
if not callable(getattr(self, "ReadEndpoint", None)): | |
raise NotImplementedError | |
# Run startup hooks | |
self.run_hooks("Read", "init", req) | |
# Trigger the ReadEndpoint | |
self.run_hooks("Read", "pre_get_data", req) | |
self.ReadEndpoint(self.mongo_client).get_data(req) | |
self.run_hooks("Read", "post_get_data", req) | |
# Set up the response | |
self.run_hooks("Read", "pre_serialize_response", req) | |
resp.body = self.serialize_response(req) | |
self.run_hooks("Read", "post_serialize_response", req) | |
# Cleanup | |
self.run_hooks("Read", "shutdown", req, resp) | |
def on_post(self, req, resp): | |
if not callable(getattr(self, "CreateEndpoint", None)): | |
raise NotImplementedError | |
def on_put(self, req, resp): | |
if not callable(getattr(self, "UpdateEndpoint", None)): | |
raise NotImplementedError | |
def on_delete(self, req, resp): | |
if not callable(getattr(self, "DeleteEndpoint", None)): | |
raise NotImplementedError | |
class FilterMixin: | |
def __init__(self, *args, **kwargs): | |
super().__init__(*args, **kwargs) | |
self.add_hook("Read", "pre_get_data", hooks.filter_queryset) | |
class PaginationMixin: | |
def __init__(self, *args, **kwargs): | |
super().__init__(*args, **kwargs) | |
# Perform pagination on the queryset object | |
self.add_hook("Read", "pre_get_data", hooks.paginate_queryset) |
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